public class PhoneTest {

    public static void main(String[] args) {

        CellPhone c1 = new NewPhone();
        c1.call();
        c1.sendMessage();
        IPlayGame c2 = new NewPhone();
        c2.playGame();

        System.out.println("------------------");

        CellPhone c3 = new OldPhone();
        c3.call();
        c3.sendMessage();
    }
}
